/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { ts, rule } from "qvog-dsl";

const SEVERITY = 2;
const DOC_PATH = 'docs/no-path-concat.md';
const DESCRIPTION = 'Avoid string concatenation for building file paths. Use path.join or similar APIs to prevent path traversal vulnerabilities.';

export default rule()
  .match(ts.isBinaryExpression)
  .when(node => {
      // 检查是否是字符串拼接，并且涉及路径变量
      if (node.operatorToken.kind !== ts.SyntaxKind.PlusToken) {
          return false;
      }

      const isStringConcat = ts.isStringLiteral(node.left) || ts.isStringLiteral(node.right);
      const hasPathVariable = (ts.isIdentifier(node.left) && /path|__dirname|__filename/i.test(node.left.getText())) ||
                              (ts.isIdentifier(node.right) && /path|__dirname|__filename/i.test(node.right.getText()));

      return isStringConcat && hasPathVariable;
  })
  .report({
      severity: SEVERITY,
      description: DESCRIPTION,
      docPath: DOC_PATH,
  });
